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<p>[QUOTE=&quot;Just Carl, post: 131770, member: 4552&quot;]Actually the humidity has little to do with the reaction of dissimilar metals touching each other. The principle is really commonly used for the thing called a thermocoulple. It is the temperature change that causes the problem. Two dissimilar metals touching each other, bonded together would be better, will create an electrical current as the temperature changes. This current is the movement of electrons thoughout the metals that can be measured with a meter and is used throughout the world to measure changes in temperature. This same principle is why a ground rod can not be made of copper if the soil contains large amounts of aluminum. The coins in the Aluminum foil remained untouched possibly due to little temperature changes in the invironment that they were stored. ALL metals have the previously stated reaction when touching, however the more reactive a metall, the faster the reation. Such metals as Aluminum, Copper, Silver that are already high on the electrical activity charts would tend to react the fastest.[/QUOTE]</p><p><br /></p>

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